Company lists · Data refreshed September 2026

Top 25 Decarbonization consultancies worldwide

Name: Decarbonization consultancies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 30,335 companies tracked

RevenueBase identified 30,335 company matches for decarbonization consultancies worldwide as of September 2026 and tracks 505,858 professional contacts across them, including 164,784 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for decarbonization consultancies worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 28, 2026. Country and city lists for decarbonization consultancies follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list RevenueBase SmartSearch · Exact Recorded Sep 28, 2026 How this list was built

30,335Companies

505,858Contacts tracked

164,784Verified emails

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The 25 largest decarbonization consultancies worldwide

Ranked by team size

Top 25 of 30,335 company matches for decarbonization consultancies worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 28, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Johnson Controls	Exact match	Cork, IrelandHQ recorded Sep 28, 2026	10001+	52,736 contacts →
	Exact match “Johnson Controls is a global leader in thermal management, mission-critical building systems, energy efficiency and decarbonization.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
2	Worley	Exact match	Sydney, AustraliaHQ recorded Sep 28, 2026	10001+	34,763 contacts →
	Exact match “Worley is a global professional services company of energy, chemicals and resources experts headquartered in Australia.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
3	Arcadis	Exact match	Amsterdam, NetherlandsHQ recorded Sep 28, 2026	10001+	33,846 contacts →
	Exact match “Arcadis is a leading global partner, delivering transformative projects with businesses, cities and industries.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
4	Engie Solutions France	Exact match	La Garenne-colombes, FranceHQ recorded Sep 28, 2026	10001+	12,011 contacts →
	Exact match “Les activités Infrastructures Energétiques Locales d’ENGIE accompagnent les collectivités, les industries et le secteur du bâtiment sur la voie de la décarbonation.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
5	Wärtsilä	Exact match	Helsinki, FinlandHQ recorded Sep 28, 2026	10001+	10,360 contacts →
	Exact match “We are a global leader in innovative technologies and services shaping the decarbonisation of marine and energy.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
6	Carrier Hvac	Exact match	United StatesHQ recorded Sep 28, 2026	10001+	10,099 contacts →
	Exact match “Carrier is a global leader in intelligent climate and energy solutions, pioneering sustainable innovations in climate technologies.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
7	ERM	Exact match	London, United KingdomHQ recorded Sep 28, 2026	5,001-10,000	9,119 contacts →
	Exact match “Sustainability is our business.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
8	Dalkia	Exact match	Saint-andré-lez-lille, FranceHQ recorded Sep 28, 2026	10001+	8,427 contacts →
	Exact match “Dalkia : ensemble, relevons le défi climatique!” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
9	Johnson Matthey	Exact match	London, ItalyHQ recorded Sep 28, 2026	5,001-10,000	8,053 contacts →
	Exact match “Johnson Matthey (JM) is a world leader in platinum group metals (PGMs).” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
10	RENEW	Exact match	Gurugram, IndiaHQ recorded Sep 28, 2026	1,001-5,000	4,340 contacts →
	Exact match “ReNew is a leading decarbonisation solutions provider and the first Indian clean energy company to list on Nasdaq (Nasdaq: RNW).” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
11	Sargent & Lundy	Exact match	Chicago, WY, United StatesHQ recorded Sep 28, 2026	1,001-5,000	4,156 contacts →
	Exact match “Sargent & Lundy is one of the world’s longest-standing full-service architect engineering firms.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
12	Veolia UK	Exact match	London, United KingdomHQ recorded Sep 28, 2026	10001+	2,823 contacts →
	Exact match “Veolia UK provides solutions for ecological transformation which means reconciling human progress with environmental protection.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
13	Shell Energy	Exact match	London, United KingdomHQ recorded Sep 28, 2026	1,001-5,000	2,627 contacts →
	Exact match “We help businesses manage energy needs, boost efficiency, control costs and achieve decarbonisation goals for a better energy future.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
14	Topsoe	Exact match	Kongens Lyngby, United StatesHQ recorded Sep 28, 2026	1,001-5,000	2,616 contacts →
	Exact match “Topsoe is a leading global provider of technology and solutions for the energy transition.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
15	Ambipar	Exact match	Sao Paulo, BrazilHQ recorded Sep 28, 2026	10001+	2,599 contacts →
	Exact match “Our mission is to promote ecological transformation by investing in decarbonization projects, circular economy, energy transition, and environmental regeneration.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
16	Mckinstry	Exact match	Seattle, WA, United StatesHQ recorded Sep 28, 2026	1,001-5,000	2,213 contacts →
	Exact match “We're a national construction and energy services company dedicated to innovating the waste and climate harm out of the built environment.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
17	Clearesult	Exact match	Austin, TX, United StatesHQ recorded Sep 28, 2026	1,001-5,000	2,121 contacts →
	Exact match “CLEAResult is the largest provider of energy efficiency, energy transition and energy sustainability services in North America.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
18	Baycurrent	Exact match	港区, JapanHQ recorded Sep 28, 2026	5,001-10,000	1,900 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
19	Salas O'brien	Exact match	Irvine, CA, United StatesHQ recorded Sep 28, 2026	1,001-5,000	1,843 contacts →
	Exact match “Salas O’Brien is an employee-owned engineering and technical services firm focused on advancing the human experience through the built environment.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
20	GE Digital	Exact match	San Ramon, CA, United StatesHQ recorded Sep 28, 2026	1,001-5,000	1,763 contacts →
	Exact match “At GE Digital, our focus is clear: delivering software that accelerates a new era of energy.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
21	Ameresco	Exact match	Framingham, MA, United StatesHQ recorded Sep 28, 2026	1,001-5,000	1,383 contacts →
	Exact match “Ameresco, Inc.(NYSE:AMRC) is a leading energy infrastructure solutions provider dedicated to helping customers reduce costs, enhance resilience, and decarbonize to net zero in the…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
22	DGE Danmark	Exact match	Højbjerg, DenmarkHQ recorded Sep 28, 2026	n/a	1,176 contacts →
	Exact match “Miljø er vores kernekompetence og vores ansvar.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
23	OLA	Exact match	Austin, TX, United StatesHQ recorded Sep 28, 2026	n/a	1,145 contacts →
	Exact match “OLA Sustainability, LLC OLA Sustainability is a consulting firm that focuses on integrating sustainable practices into commercial and multifamily design projects.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
24	Aden Group	Exact match	SingaporeHQ recorded Sep 28, 2026	10001+	1,105 contacts →
	Exact match “Aden Group is a Euro-Asian enterprise delivering comprehensive solutions to boost decarbonization, productivity and energy transition in the built environment.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
25	California Resources Corporation	Exact match	Los Angeles, CA, United StatesHQ recorded Sep 28, 2026	1,001-5,000	1,095 contacts →
	Exact match “California Resources Corporation (CRC) is an independent energy and carbon management company committed to energy transition.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “decarbonization consultancies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 30,335 decarbonization consultancies worldwide

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Decarbonization consultancies worldwide at a glance

As of Sep 28, 2026

32.6%Verified-email coverage

16.7Average contacts per company

1-10Median size (employees)

3.0%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

21,141

11-50

7,123

51-200

1,430

201-500

289

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for decarbonization consultancies are linked below.
What qualifies: Company records worldwide whose business descriptions match “decarbonization consultancies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every displayed company carries at least one verified work email. RevenueBase tracks 164,784 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 28, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Decarbonization consultancies by location

154 lists · largest first

Every Decarbonization consultancies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “decarbonization consultancies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many decarbonization consultancies are there worldwide?

RevenueBase identified 30,335 company matches for decarbonization consultancies worldwide as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Johnson Controls tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most decarbonization consultancies?

The United States leads with 3,279 companies, followed by the United Kingdom (2,751) and France (2,446). Every decarbonization consultancies list by country and city is linked on this page.

Which city has the most decarbonization consultancies?

London leads with 915 company records, followed by Paris (529) and Sao Paulo (326).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 164,784 professional contacts with verified work emails tracked across these 30,335 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 28, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.